Audi Connect data tethering on MIB2

[Scrat]

I'm trying to activate Audi Connect with usb data tethering on my A6 model 2017 with a MIB2 unit that does not have a simcard slot.
This was perfectly possible on the MMI3G+, as a lot of people on this forum know , but the procedure has completely changed since audi's upgrade to the MIB2 platform.
I have already been successful in enabling all the Audi Connect functions and menu options.

These settings are no longer in the green menu:

Control unit: 5F Information Control Unit 1


<Long coding>
byte_15_Phone_NAD, On (OBDEleven)


<Adaptation>
IDE02122-Developer mode,Activated (OBDEleven)
IDE03471-ENG06575-Vehicle configuration-UOTA,On
IDE03471-ENG117848-Vehicle configuration-gracenote_online_coverarts,On
IDE03471-ENG117849-Vehicle configuration-gracenote_online_other,On
IDE03471-ENG117843-Vehicle configuration-my_audi,On
IDE03471-ENG117845-Vehicle configuration-online_dictation,On
IDE03471-ENG127495-Vehicle configuration-online_media,On
IDE03471-ENG117840-Vehicle configuration-online_navigation,On
IDE03471-ENG117837-Vehicle configuration-online_POI,On
IDE03471-ENG117838-Vehicle configuration-online_POI_voice,On
IDE03471-ENG117839-Vehicle configuration-online_portal_browser_services,On
IDE03471-ENG117841-Vehicle configuration-online_street_view,On


I've discovered that on the MIB2 the only supported ethernet device is the D-Link DUB-E100 (Revision B1 or C1).
On the MMI3GP you could also use any other usb dongle based on the ASIX chipset, but not anymore.

#D-Link DUB-E100 USB Dongle
device(usb, ven=2001,dev=3c05)
device(usb, ven=2001,dev=1a02)

Also, after inserting this device a script called extnet.sh is started:

                start ( /etc/scripts/extnet.sh )

This script will automatically route all internet traffic and diagnostics to the ip of the ethernet dongle, but it will only do this if a marker file named 'dataoverdlink' is present:

    if [[ -e /var/dataoverdlink ]]; then
        # Set default route for debugging and data
        /mnt/app/armle/sbin/route add default 172.16.250.248
        echo "extnet.sh: /var/dataoverdlink was found -> Use $IFACE for internet traffic and debugging"

Does anyone have an idea how i can execute a script on my unit ?